h264 vui,time_scale,time_tick from sps

Question

I use ffmpeg to send the RTP of mp4 (only video) to my RTP Server. And I could retrieve the RTP packet and get the 67 42 ... (sps).

But I want to calculate the frame rate from the sps(using vui(if flag == 1), time_tick and time_scale).

Are there any source code(such as open source) could resolve the sps ?

thanks !

score 2 · Answer 1 · edited May 23 '17 at 11:59

2

H.264 specification, which describes the bitstream including SPS, VUI information etc.
H.264 VUI parsing code in GraphStudioNext application source code
Fetching the dimensions of a H264Video stream - on parsing H.264 parameter sets

edited May 23 '17 at 11:59

Community

answered Mar 01 '16 at 14:00

Roman R.

Hi thank for your help Now I can get the VUI_flag, but I could not fetch the time_scale and tick. Because there are some variable bits when I parse the bits such as bit_depth_luma_minus8(ue(v)) , bit_depth_chroma_minus8(ue(v)), offset_for_ref_frame(se(v)) and so on. – H. BY Mar 01 '16 at 15:33
[Code](https://github.com/cplussharp/graph-studio-next/blob/master/src/H264StructReader.cpp#L76) behind link 2 above succeeds in parsing this variable length data. – Roman R. Mar 01 '16 at 15:39

1 Answers1